INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-mmots-kasan-gce-5,10.128.15.230' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 35.842494] dev_remove_pack: ffff8801ca8e5040 not found [ 35.882695] ================================================================== [ 35.890126] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 [ 35.897653] Read of size 2 at addr ffff8801c48d6d80 by task sshd/2980 [ 35.904216] [ 35.905839] CPU: 0 PID: 2980 Comm: sshd Not tainted 4.13.0-mm1+ #7 [ 35.912150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.921505] Call Trace: [ 35.924089] [ 35.926253] dump_stack+0x194/0x257 [ 35.929896] ? arch_local_irq_restore+0x53/0x53 [ 35.934568] ? show_regs_print_info+0x65/0x65 [ 35.939075] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 35.944277] print_address_description+0x73/0x250 [ 35.949127] ? __netif_receive_skb_core+0x2be3/0x33d0 [ 35.954318] kasan_report+0x24e/0x340 [ 35.958127] __asan_report_load2_noabort+0x14/0x20 [ 35.963054] __netif_receive_skb_core+0x2be3/0x33d0 [ 35.968065] ? __bpf_address_lookup+0x2b0/0x2b0 [ 35.972731] ? nf_ingress+0x9f0/0x9f0 [ 35.976523] ? unwind_dump+0x4c0/0x4c0 [ 35.980401] ? check_noncircular+0x20/0x20 [ 35.984623] ? check_noncircular+0x20/0x20 [ 35.988831] ? __kernel_text_address+0xae/0xe0 [ 35.993386] ? unwind_get_return_address+0x61/0xa0 [ 35.998290] ? __save_stack_trace+0x7e/0xd0 [ 36.002601] ? depot_save_stack+0x12c/0x490 [ 36.006929] ? find_held_lock+0x39/0x1d0 [ 36.010978] ? lock_downgrade+0x990/0x990 [ 36.015106] ? SyS_select+0x194/0x230 [ 36.018895] ? lock_acquire+0x1d5/0x580 [ 36.022850] ? netif_receive_skb_internal+0x1d7/0x670 [ 36.028023] ? find_held_lock+0x39/0x1d0 [ 36.032086] ? pvclock_read_flags+0x160/0x160 [ 36.036558] ? lock_downgrade+0x990/0x990 [ 36.040699] ? lock_acquire+0x1d5/0x580 [ 36.044657] ? netif_receive_skb_internal+0xa2/0x670 [ 36.049737] ? ktime_get_with_offset+0x2c1/0x420 [ 36.054484] ? lock_release+0xd70/0xd70 [ 36.058441] ? ktime_get+0x3a0/0x3a0 [ 36.062147] __netif_receive_skb+0x2c/0x1b0 [ 36.066448] ? __netif_receive_skb+0x2c/0x1b0 [ 36.070923] netif_receive_skb_internal+0x10b/0x670 [ 36.076896] ? dev_cpu_dead+0xb00/0xb00 [ 36.080850] ? __alloc_pages_nodemask+0xd80/0xd80 [ 36.085671] ? net_rx_action+0x1910/0x1910 [ 36.089884] ? rcu_pm_notify+0xc0/0xc0 [ 36.093770] ? skb_gro_reset_offset+0x17b/0x300 [ 36.098430] napi_gro_receive+0x3d0/0x500 [ 36.102555] ? dev_gro_receive+0x19b0/0x19b0 [ 36.106939] ? eth_type_trans+0x2a3/0x650 [ 36.111070] ? eth_gro_receive+0x810/0x810 [ 36.115311] receive_buf+0xcc5/0x51f0 [ 36.119112] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 36.123680] ? print_usage_bug+0x480/0x480 [ 36.127906] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.132912] ? unwind_dump+0x4c0/0x4c0 [ 36.136793] ? unwind_dump+0x4c0/0x4c0 [ 36.140678] ? lock_pin_lock+0x370/0x370 [ 36.144720] ? __unwind_start+0x169/0x330 [ 36.148859] ? unwind_get_return_address+0x61/0xa0 [ 36.153767] ? __save_stack_trace+0x61/0xd0 [ 36.158080] ? __run_timers+0x7fd/0xb90 [ 36.162052] ? __lock_acquire+0x732/0x4620 [ 36.166269] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 36.172152] ? smp_apic_timer_interrupt+0x177/0x710 [ 36.177169] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 36.182348] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 36.188212] ? hrtimer_interrupt+0x1d4/0x5f0 [ 36.192607] ? hrtimer_interrupt+0x1d4/0x5f0 [ 36.196996] ? save_stack_trace+0x16/0x20 [ 36.201144] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.206148] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.211140] ? unwind_dump+0x4c0/0x4c0 [ 36.215011] ? unwind_dump+0x4c0/0x4c0 [ 36.218883] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.223904] ? __unwind_start+0x169/0x330 [ 36.228043] ? unwind_get_return_address+0x61/0xa0 [ 36.232951] ? __save_stack_trace+0x61/0xd0 [ 36.237251] ? get_stack_info+0x37/0x150 [ 36.241291] ? update_stack_state+0x225/0x700 [ 36.245773] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 36.251644] ? lock_is_held_type+0x58/0x210 [ 36.255946] ? find_held_lock+0x39/0x1d0 [ 36.259986] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.264978] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.269968] ? unwind_dump+0x4c0/0x4c0 [ 36.273844] ? unwind_dump+0x4c0/0x4c0 [ 36.277721] ? pvclock_read_flags+0x160/0x160 [ 36.282193] ? __unwind_start+0x169/0x330 [ 36.286323] ? print_usage_bug+0x480/0x480 [ 36.290544] ? unwind_get_return_address+0x61/0xa0 [ 36.295452] ? __save_stack_trace+0x61/0xd0 [ 36.299753] ? lock_is_held_type+0x58/0x210 [ 36.304061] ? save_stack_trace+0x16/0x20 [ 36.308193] ? __lock_acquire+0x20fd/0x4620 [ 36.312510] ? vring_use_dma_api+0x7f/0xa0 [ 36.316740] ? vring_unmap_one+0x49/0x3d0 [ 36.320866] ? detach_buf+0x463/0x6a0 [ 36.324673] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 36.329426] ? common_interrupt+0x9d/0x9d [ 36.333558] ? detach_buf+0x6a0/0x6a0 [ 36.337341] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 36.342339] virtnet_poll+0x304/0xad0 [ 36.346126] ? receive_buf+0x51f0/0x51f0 [ 36.350171] ? unwind_dump+0x4c0/0x4c0 [ 36.354054] ? net_rx_action+0x49b/0x1910 [ 36.358197] net_rx_action+0x792/0x1910 [ 36.362179] ? napi_complete_done+0x6c0/0x6c0 [ 36.366650] ? save_stack_trace+0x16/0x20 [ 36.370774] ? __lock_acquire+0x20fd/0x4620 [ 36.375070] ? __lock_is_held+0xbc/0x140 [ 36.379123] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 36.384289] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 36.389455] ? check_noncircular+0x20/0x20 [ 36.393664] ? check_noncircular+0x20/0x20 [ 36.397877] ? rcu_pm_notify+0xc0/0xc0 [ 36.401749] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.406741] ? __raise_softirq_irqoff+0x21c/0x2c0 [ 36.411557] ? raise_softirq+0x490/0x490 [ 36.415592] ? lock_downgrade+0x990/0x990 [ 36.419724] ? lock_acquire+0x1d5/0x580 [ 36.423677] ? clockevents_program_event+0x163/0x2e0 [ 36.428769] ? trace_hardirqs_off+0xd/0x10 [ 36.432987] ? __napi_schedule+0x25e/0x370 [ 36.437212] ? netdev_info+0x170/0x170 [ 36.441082] ? check_noncircular+0x20/0x20 [ 36.445301] ? check_noncircular+0x20/0x20 [ 36.449526] ? rcu_pm_notify+0xc0/0xc0 [ 36.453400] ? rcu_read_lock_sched_held+0x108/0x120 [ 36.458419] ? __handle_irq_event_percpu+0x308/0x9d0 [ 36.463520] ? rcu_pm_notify+0xc0/0xc0 [ 36.467405] __do_softirq+0x2bb/0xbd0 [ 36.471192] ? __softirqentry_text_start+0x8/0x8 [ 36.475925] ? do_raw_spin_trylock+0x190/0x190 [ 36.480489] ? handle_irq_event_percpu+0x141/0x1b0 [ 36.485408] ? __handle_irq_event_percpu+0x9d0/0x9d0 [ 36.490500] ? _raw_spin_lock+0x32/0x40 [ 36.494472] ? _raw_spin_unlock+0x22/0x30 [ 36.498600] ? handle_edge_irq+0x2b4/0x7c0 [ 36.502822] irq_exit+0x1d3/0x210 [ 36.506260] do_IRQ+0xf6/0x190 [ 36.509435] common_interrupt+0x9d/0x9d [ 36.513386] [ 36.515600] RIP: 0010:__virt_addr_valid+0xd8/0x190 [ 36.520513] RSP: 0018:ffff8801d4abfae0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff6e [ 36.528200] RAX: dffffc0000000000 RBX: ffff88021fff8000 RCX: 000000000000002e [ 36.535454] RDX: 1ffffffff0e0e900 RSI: 0000000000000008 RDI: ffffffff87074800 [ 36.542702] RBP: ffff8801d4abfaf8 R08: 0000000000000000 R09: 1ffff1003a957f5a [ 36.549946] R10: ffff8801cf3be600 R11: 0000000000000000 R12: 0000000000000000 [ 36.557192] R13: 000000000000003a R14: 0000000000000008 R15: 000056352c4a0b10 [ 36.564468] __check_object_size+0xbe/0x4f0 [ 36.568771] ? check_stack_object+0x140/0x140 [ 36.573250] ? __lock_is_held+0xbc/0x140 [ 36.577315] core_sys_select+0x389/0x960 [ 36.581377] ? poll_select_set_timeout+0x210/0x210 [ 36.586288] ? kvm_clock_get_cycles+0x25/0x30 [ 36.590769] ? timespec64_add_safe+0x1bb/0x2c0 [ 36.595337] ? timespec_add_safe+0x280/0x280 [ 36.599737] ? poll_select_set_timeout+0x12f/0x210 [ 36.604642] ? do_restart_poll+0x2a0/0x2a0 [ 36.608860] ? kasan_check_write+0x14/0x20 [ 36.613089] SyS_select+0x194/0x230 [ 36.616695] ? core_sys_select+0x960/0x960 [ 36.620902] ? SyS_read+0x184/0x220 [ 36.624508] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 36.629339] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.634330] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.639071] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.643797] RIP: 0033:0x7f3ce01bbdd3 [ 36.647481] RSP: 002b:00007fffedb675b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 36.655171] RAX: ffffffffffffffda RBX: 00007fffedb67640 RCX: 00007f3ce01bbdd3 [ 36.662414] RDX: 000056352c4a0af0 RSI: 000056352c4a0b10 RDI: 000000000000000c [ 36.669666] RBP: 0000000000000082 R08: 00007fffedb675e0 R09: 0101010101010101 [ 36.676914] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000001fe96e [ 36.684158] R13: 000056352c4a0af0 R14: 000056352c4a0b10 R15: 000056352c4a1fb0 [ 36.691419] [ 36.693024] Allocated by task 7572: [ 36.696635] save_stack_trace+0x16/0x20 [ 36.700585] save_stack+0x43/0xd0 [ 36.704016] kasan_kmalloc+0xad/0xe0 [ 36.707713] kmem_cache_alloc_trace+0x136/0x750 [ 36.712358] fanout_add+0xa50/0x1190 [ 36.716051] packet_setsockopt+0xfdc/0x1e80 [ 36.720354] SyS_setsockopt+0x189/0x360 [ 36.724304] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.729038] [ 36.730666] Freed by task 7481: [ 36.733917] save_stack_trace+0x16/0x20 [ 36.737865] save_stack+0x43/0xd0 [ 36.741290] kasan_slab_free+0x71/0xc0 [ 36.745150] kfree+0xca/0x250 [ 36.748237] packet_release+0xa8f/0xd70 [ 36.752194] sock_release+0x8d/0x1e0 [ 36.755885] sock_close+0x16/0x20 [ 36.759317] __fput+0x333/0x7f0 [ 36.762575] ____fput+0x15/0x20 [ 36.765833] task_work_run+0x199/0x270 [ 36.769701] do_exit+0xa52/0x1b40 [ 36.773125] do_group_exit+0x149/0x400 [ 36.776982] SyS_exit_group+0x1d/0x20 [ 36.780752] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.785474] [ 36.787085] The buggy address belongs to the object at ffff8801c48d6500 [ 36.787085] which belongs to the cache kmalloc-4096 of size 4096 [ 36.799905] The buggy address is located 2176 bytes inside of [ 36.799905] 4096-byte region [ffff8801c48d6500, ffff8801c48d7500) [ 36.811935] The buggy address belongs to the page: [ 36.816848] page:ffffea0007123580 count:1 mapcount:0 mapping:ffff8801c48d6500 index:0x0 compound_mapcount: 0 [ 36.826826] flags: 0x200000000008100(slab|head) [ 36.831482] raw: 0200000000008100 ffff8801c48d6500 0000000000000000 0000000100000001 [ 36.839353] raw: ffffea000713de20 ffffea0007127320 ffff8801dac00dc0 0000000000000000 [ 36.847219] page dumped because: kasan: bad access detected [ 36.852901] [ 36.854503] Memory state around the buggy address: [ 36.859499] ffff8801c48d6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.866837] ffff8801c48d6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.874181] >ffff8801c48d6d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.881520] ^